public class Demo22 {
    public static void main(String[] args) throws InterruptedException {
        Object locker1 = new Object();
        Object locker2 = new Object();

        Thread t1 = new Thread(() -> {
            synchronized (locker1) {
                try {
                    // 为了更好的控制线程的执行顺序, 引入 sleep, 否则死锁可能重现不出来.
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                synchronized (locker2) {
                    System.out.println("t1 获取了两把锁");
                }
            }
        });
        Thread t2 = new Thread(() -> {
            synchronized (locker1) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                synchronized (locker2) {
                    System.out.println("t2 获取到两把锁");
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
    }
}